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Class Information
Number:
33/491
Name:
Geometrical instruments
>
Straightedge type
>
Rules
>
With attachment
> Selectable
Description:
Subject matter wherein the straightedge is constructed to provide a choice of ruling edges.
Patents under this class:
Patent Number
Title Of Patent
Date Issued
7415772
Rainbow ruler
Aug. 26, 2008
6813841
Measuring device for teaching incremental measurements
Nov. 9, 2004
6816805
Computer generated scale and conversion instrument
Nov. 9, 2004
6243959
Measuring and instructional ruler
Jun. 12, 2001
5881469
Measuring and instructional ruler
Mar. 16, 1999
5822875
Scanning electron microscopic ruler and method
Oct. 20, 1998
5479719
Rolling ruler
Jan. 2, 1996
4839833
Programmable display engineering scale
Jun. 13, 1989
4707928
Vari-scale
Nov. 24, 1987
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